linux-kernel - Re: [RFC PATCH v5 0/7] Speed booting by sorting ORC unwind tables at build time

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Message-ID: <20191202121029.GA37334@gmail.com>
Date:   Mon, 2 Dec 2019 13:10:29 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Shile Zhang <shile.zhang@...ux.alibaba.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...capital.net>, x86@...nel.org,
        "H . Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org
Subject: Re: [RFC PATCH v5 0/7] Speed booting by sorting ORC unwind tables at
 build time


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Thu, Nov 28, 2019 at 07:01:59PM +0800, Shile Zhang wrote:
> > This series refactored the original sortextable tools, add ORC unwind
> > tables sort at build time.
> > 
> > To sort the ORC unwind tables(.orc_unwind & .orc_unwind_ip) can save
> > about 100ms in my test ENV (2C4G VM w/ Xeon 2.5GHz CPU).
> > It costs about 30ms sort by new sorttable tool.
> 
> IIRC from your previous emails the new build-time sort is actually
> shorter than that, so even for single build+run scenarios we win.
> 
> The code looks good to me, so:
> 
> Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> 
> Who it going to apply this? I suppose we could take it through -tip,
> like we do with all x86 and objtool related bits.

Yeah, will apply it once the merge window slows down a bit.

Thanks,

	Ingo